Here is the full list of all 48 Dead Island achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Complete act 4.
Find 120 collectibles.
Complete act 3.
Customize 25 weapons
Complete act 2.
Finish 75 quests cumulatively.
Find 60 collectibles.
Kill 50 human enemies.
Reach level 25.
Kill 250 zombies with modified weapons.
Sever 100 limbs.
Complete act 1.
Kill 250 zombies using edged melee weapons.
Create weapons to rival the gods of fire or thunder.
Kill a Suicider with a grenade.
Drive a total distance of 10 kilometers.
Kill 50 zombies using a vehicle.
Kill a zombie with 10 different melee weapons.
Reach level 10.
Breach a locked door with the first blow.
Play Dead Island at least 28 days after starting it for the first time.
Create a customized weapon.
Kill 5 Infected in a row with a single blow.
Use a hammer to kill a series of 15 zombies without taking damage.
Set 10 zombies on fire simultaneously.
Kill 10 zombies in a row with headshots.
Kill 250 zombies using blunt melee weapons.
Kill 250 zombies using firearms.
Kill 25 zombies with your bare fists.
Kill an Infected with a grenade blast.
Travel a distance of 20 kilometers on foot.
Explore the entire island.
Heal yourself with a medkit 100 times.
Use a large medkit to heal an injury of 5% or less.
Complete act 1 with 4 different characters.
Reach level 50
Save 5 people besieged by zombies.
Join another player's game.
Play with 10 different co-op partners for at least 15 minutes each.
Play in a co-op team of 4 different playable characters.
Complete 5 quests in a single co-op game with the same partners.
Complete 25 quests while playing with at least one co-op partner.
Complete 5 quests with 3 co-op partners.
Kill 100 enemies with Fury attacks.
Kill 150 enemies using Analog Fighting controls.
Kill a Ram using tackle skill.
Kill a Butcher using an axe
Loot 25 Exceptional Weapons.